John said organizers could not know for sure how many people with tickets did not go to the tournament, held the week of Feb. 3.

The rain effect was felt throughout the Monterey Peninsula at a time when hotels and businesses usually see a strong boost in tourism.

Shuttles to Pebble Beach from Pacific Grove and Monterey had a more than 10 percent drop in ridership. Hotels reported cancellations Saturday night, a rare occurrence during the AT&T Pro-Am.

The tournament has raised more than $110million for charity since it started in 1937. The AT&T Pro-Am represents a $70 million influx of cash to the area, according to a 2010 study from its host, the Monterey Peninsula Foundation.

The event brought in $9.5 million for the foundation in 2012, according to its most recently available tax returns. John said reduced ticket sales will not reduce the foundation's giving.

More than 200 organizations receive money from the foundation each year. They include First Night Monterey, Sunrise House, San Francisco 49ers Foundation, Diocese of Monterey, Big Sur Volunteer Fire Brigade and Hemophilia Foundation of Northern California.